Air Patriots seems worth that $2.99 price as, while the controls are a little demanding, it's a fun twist on the genre. I'd prefer to pay up front for such content, though. Dishing out for a trickle of in-app purchases just feels a little disingenuous.

It's hard to take credit away from Air Patriots for trying to do something new, especially when it works. But it only works on the gameplay side of things. Although you'll have fun playing this game, you won't enjoy finishing the first map and then being told to pony up some cash to unlock the next one.